摘要
目的:制备并鉴定促红细胞生成素衍生肽(HBSP)并探讨其在大鼠肾脏缺血再灌注损伤中的保护作用及其机制。方法:制备并检测HBSP的纯度及分子量。200~220g SD大鼠随机分为假手术组、缺血组、HBSP组。阻断左侧肾蒂45min后切除右侧肾脏模型。术中及术后每6h给予HBSP,检测术后48h肾功能及炎症细胞因子肿瘤坏死因子-α(TNF-α),观察病理学改变,采用末端转移酶标记技术(TUNEL)法检测肾小管上皮细胞凋亡,并检测肾组织核转录因子-κB(NF-κB)活性。结果:HBSP纯度达98%,分子量与理论分子量吻合,HBSP组术后48h肾功能好于缺血组,组织中TNF-α水平及NF-κB活性显著低于缺血组(P〈0.05),HE切片组织损伤减轻,TUNEL染色示HBSP组阳性细胞数显著少于缺血组(P〈0.05)。结论:由促红细胞生成素成功制备线性多肽HBSP,其通过减轻炎性反应及抑制肾小管细胞凋亡,保护肾脏缺血再灌注损伤大鼠的肾功能。
Objective:To prepare and identify the helix B-surface peptide(HBSP),a erythropoietin(EPO) derivative peptide,and investigate its protective effect on renal ischemia-reperfusion(IR) injury.Methods:HBSP was synthesized and identified.In order to investigate the role of renal protection,48 male Sprague-Dawley rats(200-220 g) were divided into three groups,Group Sham,Group IR and Group HBSP.IR model was made by 45 minutes of left renal ischemia with non-traumatic vascular clamps and right nephrectomy after the clamp was released.Serum creatinine,urea nitrogen and renal pathology were detected as well as the expression of tumor necrosis factor alpha(TNF-α),nuclear factor-kappa B(NF-κB).Apoptosis of tubular epithelium was observed by the terminal deoxynucleotidyl transferase-midiated dUTP-biotin nick end-labeling(TUNEL) assay.Results: The product purity was 98.2%,and the molecular weight was the same as we hypothesized before.Both serum creatinine and urea nitrogen were decreased in Group HBSP,accompanied with significantly mild histological damage and less TUNEL-positive cells.The expression level of TNF-α and NF-κB in Group HBSP was also decreased.Conclusions: HBSP is successfully prepared and indentified.HBSP attenuates renal ischemia reperfusion injury.The protective effect is mediated by its inhibition of inflamation and tubular epithelium apoptosis.
出处
《中国临床医学》
2011年第1期25-28,共4页
Chinese Journal of Clinical Medicine
基金
"十一五"国家科技支撑计划项目(编号:2008BAI60B04)
上海市科学技术委员会基金资助项目(编号:09DZ2260300)